Based on this product's specifications, here are some alternatives and similar models
Replacement dirty water tank assembly for Roborock Dyad vacuum cleaner accessory, model 9.02.0229
Summary description:
Replacement dirty water tank assembly compatible with the Roborock Dyad vacuum cleaner. This OEM-design spare part (MPN 9.02.0229) collects and stores dirty water removed during wet cleaning cycles. It is intended for maintenance and repair to restore proper wastewater collection, enabling continued wet and hybrid cleaning performance and helping maintain hygiene and suction efficiency.